LDLN050
Datasheet
500 mA, high performance low dropout linear regulator
Features
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DFN8 (3 x 3 mm)
Input voltage range: 2.7 V to 6.5 V
Very low output voltage noise: 13 µV
RMS
/V
OUT
Low quiescent current: 48 µA typical
500 mA guaranteed output current
Fast start-up time: 50 µs
High PSRR: 65 dB at 100 Hz
-40 °C to 125 °C ambient operative temperature range
Very low dropout: 190 mV at max. I
OUT
Adjustable (from 1.25 V to 6 V) or fixed output voltage on request (from 1.0 V to
4.3 V)
Stable with low ESR capacitor: min. 2 µF
Current limit and thermal protections
DFN8 (3 x 3 mm) standard for industrial
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Application
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Maturity status link
LDLN050
Low noise POL
Wireless communication
Industrial applications
Description
The
LDLN050
is a 500 mA LDO regulator, designed to be used in several
environments. The
LDLN050
has a very low-resistance pass element (PMOS) that
is even very fast during the turn-on.
Thanks to its low-noise design, the
LDLN050
can be used to supply noise sensitive
circuits such as sensors, MCUs and wireless ICs in industrial applications.
The LDO low current consumption (typically 48 µA) is also used on battery-supplied
applications.
On the adjustable version, the output voltage can be set to any desired value
between 1.25 V and 6 V. Fixed voltage versions, between 1.0 V and 4.3 V (with
0.1 V step) can be provided upon request.
On the fixed voltage versions only, an external capacitor can be connected to C
NR
pin to further reduce the noise on the regulated output voltage.
The
LDLN050
is available in DFN8 (3 x 3 mm) package.
DS12809
-
Rev 4
-
September 2021
For further information contact your local STMicroelectronics sales office.
www.st.com
LDLN050
Pin configuration
2
Pin configuration
Figure 3.
Pin connection, DFN8 – 3 x 3 (top view)
1
2
3
4
Exposed
pad
8
7
6
5
Table 1.
Pin description
Pin
1
2
3
4
5
6
7
8
Exp. Pad.
Symbol
OUT
N.C.
FB (ADJ)
NR (FIXED)
GND
EN
N.C.
N.C.
IN
Exposed thermal Pad
Output pin
Not internally connected
Feedback pin on adjustable version
Noise reduction on fixed version
Ground connection
Enable pin logic input: Low=shutdown, High=active
This pin is not internally pulled up. Don't leave floating.
Not internally connected
Not internally connected
Input pin
Must be connected to GND
Function
DS12809
-
Rev 4
page 3/22
LDLN050
Maximum ratings
4
Maximum ratings
Table 2.
Absolute maximum ratings
Symbol
V
IN
V
EN
V
OUT
V
FB
I
OUT
P
DIS
T
ST
T
j
Parameter
Input voltage pin
Enable pin
DC output voltage
Feedback pin
Output current
Maximum Power dissipation
Storage temperature range
Operating Junction temperature range
Value
-0.3 to 7
-0.3 to V
IN
+ 0.3
-0.3 to V
IN
+ 0.3
-0.3 to 1.6
Internally limited
Refer to
Table 3. Thermal data
-55 to 150
-40 to 150
Unit
V
V
V
V
A
W
°C
°C
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur. Functional
operation under these conditions is not implied. All values are referred to GND.
Table 3.
Thermal data
Symbol
R
thJA
Ψ
J-T
Parameter
Thermal resistance junction-ambient
Thermal characterization parameter junction to top of package
DFN8 3x3 mm
51
2.4
Unit
°C/W
°C/W
Note:
JEDEC 2S2P (4L) board as per JESD 51-7 with two thermal vias.
Table 4.
Electrostatic discharge
Symbol
HBM
Human Body Model
Parameter
DFN8 3x3
+/-2000
Unit
V
DS12809
-
Rev 4
page 5/22
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